[troyb]

It sure sounds like there is a preference mucking things up somewhere. If you set aside your preferences does the problem go away?

Quit OmniWeb.
In Finder, set this file aside: ~/Library/Preferences/com.omnigroup.OmniWeb5.plist
Relaunch OmniWeb and visit google finance.

Any luck?

You can quit OmniWeb and put that preference file back (overwriting the new one) to restore your settings.